Vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner showing my new design;

FIG. 2 is a Front Elevation View thereof;

FIG. 3 is a Rear Elevation View thereof;

FIG. 4 is a Left-side Elevation View thereof;

FIG. 5 is a Right-side Elevation View thereof;

FIG. 6 is a Top Plan View thereof; and,

FIG. 7 is a Bottom Plan View thereof. 

I claim the ornamental design for a vacuum cleaner, as shown and described. 